I don't know if KC intentionally used the names for her own purposes.. as a clue to the location of the body or for any other reason. I do know that 'coincidence' can get beyond being a 'coincidence' at times though.
Just start researching a subject in depth, and suddenly it turns up everywhere you go. Let your mind dwell on some obscure subject and it becomes a topic for discussion at coffee break. I have no idea why this happens but it does.
I once tried to write a short story with a character named Orest Malanchuck as it's chief character.. he owned a black standard poodle..drove a red 85 Fiero Pontiac..
In real life I never knew anyone called Orest, nor Malanchuck, nor did I know anyone with a black standard poodle, nor for that matter can I recall ever knowing anyone with a red 85 Fiero Pontiac..(although I may have and forgotten)
Anyway, as I brooded over that story and over Orests doings, I met 2 guys called Orest, and a girl who's last name was 'Malenchuck'.. (pretty close) ..black standard poodles were romping in every park I went to, one of which was named 'Orest'.. and I was haunted by red 85Pontiac Fiero's passing me in the street.
I don't know how the universe works, I just know this sort of daffyness happens.. you have to call it coincidence, but when it gets too odd, I think we all secretly suspect some deeper force is at work
I think KC became interested in those names, probably had some sort of story in her head about them, and then when they started showing up in her life, she paid close attention to the coincidences. Probably was in or around the Sawgrass apts the day ZFG was there, and rushed to check out this new coincidence, to weave elements and details of what she discovered into her mental storyline.